Safety device for liquid sealed gas pressure floats



May 2 1946. w. BRISCOE 5 2,401,046

SAFETY DEVICE FOR LIQUID SEALED GAS PRESSURE FLOATS Filed March 30, 1944 Patented May 28, 1946 ZAtlfith OFFICE SAFETY DEVICE FOR LIQUID SEALED GAS PRESSURE FLOATS Withe Briscoe, Elizabeth, Pa. Application March 30, 1944, Serial No. 528,753

2 Claims.

This invention relates to a safety device for liquid sealed gas pressure floats such as are employed to control pressure regulators and the like, and is a continuation-in-part of my copending application, Serial No. 447,990, filed June 22, 194 The device may be used in connection with the flow of gas from Icy-product coke ovens to the by-product plant. An impulse line connected to the gas flow main leads to a liquid sealed float. Changes in gas pressure in the gas flow main causes the float to move up or down, this changing the position of a pilot valve to control the regulator to bring the pressure back to that at which it is desired to maintain the gas. In case the pressure in the gas flow main fluid of the seal will be blown out and the gas will escape to the air. This is undesirable since the gas is inflammable and there is danger of a fire or explosion taking place. In some instances, the pressure is suddenly reduced causflow main, this pulling the oil from the seal into the impulse pipe and thence into the gas flow main. When the gas escape to the of a sudden change of pressure.

This and other after referring to cross sectional View of the invention showing its relationship t the gas regulator.

Referring more particularly to the drawing, the reference numeral 2 indicates a casing having a cover 3. 4 is fastened to to the filler pipe the bar I8 exan equalizing spring 24 attached l2 as shown. The other end of tends beyond the pilot valve 29 and is provided with equalizing springs 21: which, as shown, are fastened to the screws 28 received in stationary nuts 36 mounted on the bracket 32 attached to the pilot valve 211. The tension on the springs 26 may be changed the bolts 28.

My improvement consists of providing a valve seat 34 at the top of the pipe 4. As shown, the

48 and held thereon by means of the nut 54. Between the disks 38 and 52 and surrounding the valve stem 44 is a spring 56 which bears against washers 58 to hold the disks in spaced apart relationship. It will be understood that the disks 48 and 52 may be held in the separated position by any suitable means. In order to determine the gas gage (not shown). The operation of the device is as follows:

main. Normally the movement of the bell float 5 will be such that the valve @8 and 52 will both be in open position. and the gas can move freely into the chamber l0. Formerly, when there was a sudden increase in pressure, the float 6 rose by changing the position of.

until it was stopped by the lid 3 and the pressure of the gas forced the oil from the oil seal causing it and the gas to escape from the casing 2 through the opening i5. In many instances the escaping gas caught on fire causing considerable damage. In like manner, when there was a Sudden suction on the gas main, the oil from the oil seal was drawn into the pipe 1.

With my invention the escape of the oil is prevented as follows:

When the pressure suddenly increases, the float rises to the position shown in full lines and the valve 52 seats on the lower side of the seat 3%. This prevents flow of the gas to the chamber l8 and the pilot valve will hold the regulator in position for maximum gas flow until the pressure drops, causing the float 6 to lower and opening the passage from the conduit 4 to the chamber Hi. When there is a sudden suction in the gas main, the float 6 drops and the valve 48 seats on the top of the valve seat 34 as shown in broken lines, this preventing the flow of gas into the chamber Hi. This causes the pilot valve 26 to hold the regulator in position for no gas flow until the pressure rises sufficiently to again float the float 6. By changing the positions of the disks 48 and 52 on the valve stem M, the safety device can be adjusted to seal the chamber against any predetermined pressure or suction.

While one embodiment of the invention has been shown and described, it will be understood that other adaptations and modifications may be made without departing from the scope of the following claims.

I claim:

1. A safety device for gas pressure responsive float operators, said device comprising a casing, a gas conduit extending through the bottom of said casing, a movable inverted bell float in said casing, a liquid seal surrounding said conduit and forming a gas chamber in the upper part of said bell float, a valve seat in said conduit having upper and lower faces, means forming an outlet from said conduit to said chamber, a valve stem connected to said float for movement therewith, spaced apart valve disks mounted on said stem, one of said disks being adapted to seat on said top face and the other being adapted to seat on said bottom face to close said outlet upon a predetermined change of the pressure in said gas conduit, resilient means opposing the upward and downward movement of said float, and means for changing the position of the disks on said stem for varying the pressure at which said valves will close.

2. A safety device for gas float operators, said device comprising a casing. a ga conduit extending through the bottom of said casing, a movable inverted bell float in said. casing, a liquid seal surrounding said conduit and forming a gas chamber in the upper part of said bell float, a valve seat having upper and lower faces fastened to the top of said conduit, said valve seat having an opening therein forming the only normal means of communication with said gas chamber, a valve stem connected to said float for movement therewith, spaced apart valve disks mounted on said stem, one of said disks being adapted to seat on said top face and the other being adapted to seat on said bottom face, a spring connected to said stem to oppose upward and downward movement thereof, and .means for changing the position of the disks on said stem for varying the pressure at which aid valves will close.

WITI-IE BRISCOE.

pressure responsive 

